Chimney flashing reducer?

I bought a house this year and inherited some fireplace doors. They were taken off the fireplace and stashed in the garage. Trying to put them back on, it seems like I am missing a couple parts. There are two doors, one for each side of the fireplace frame, and they slide open, folding outward. Each door has two glass panels. On the side of each door closest the side of the frame, there is a post on the bottom and the top. And on the frame there is a corresponding hole for the post to go into. The bottom hole is fixed and the top hole is on a flexible piece of metal that will give some. It looks the the bottom post is meant to be placed first and then the top post snaps in place. [B]The problem is that with the bottom post in place, the top post does not reach the hole.[/B] There is maybe a centimeter too much space. I believe I am missing some kind of bushing or spacing part that will lift the bottom post up so that the top post reaches. [ATTACH]70255[/ATTACH] [ATTACH]70256[/ATTACH] The circled part in each picture - that's where I think I am missing a bushing. I imagine it looks something like the black pieces in this hinge set: [ATTACH]70257[/ATTACH] ...but I am not positive. Can anyone confirm this is what's missing and where can I get replacements? Thanks!

I recently purchased a gothic arch cabin in Utah. A tree fell near the home and destroyed the chimney pipe and the prior owner sold the wood burning stove prior to selling. I am trying to find a replacement stove, but I am having an issue finding something that can utilize the existing hole in the wall at 29" center. I am hoping someone can help me identify the stove in the attached picture, which was taken prior to the stove being sold. I am also looking for possible recommendations for a wood burning stove with a rear vent at 29" center. I've included a couple of additional pictures for context. Everything locally is either top vent or much too short to utilize the 29" hole. Thank you in advance for your time and consideration!